Detection Mode:

- Transparency (Strict) - Select the transparent region surrounded by lines, if the
pixel's transparency is in range of [Transp diff.] parameter these pixels are treated as
transparent.

- Transparency (Fuzzy) Select the transparent region surrounded by lines more fuzzyly, if the pixel's transparency is in range of [Transp diff.] parameter these pixels are treated as transparent. This mode is sometimes more useful for roughly sketched image, but if the image is too rough this may be not so enough.

- Color Difference Select the region these colors are in range of [Color diff.] parameter with the clicked pixel's color.